Has anyone run a chronograph to check the velocity of the three - Remington - Federal - Swift - .300 GR Swift A Frame .375 H&H Factory Loads?
If so what were the velocities of the various brands of ammo?
Any accuracy preferences of the three?

I got 2400 with my 20” with Remington 300 gr. At some point I will take out the 24” to compare but haven’t done it yet. I heard that was good and seems to me it is. With a lab radar. Very acceptable accuracy as well. Took a grizzly at 180 yards

GS,
Thanks for your information on your results with the factory Remington/Swift A Frame loads.
Also congratulations on your Grizzly!

Fed 300 SWift are very accurate. I shot 2 boxes out of my 375wea. 5 shot cloverleaf. I think I have velocity recorded. later

Thank you sir. Second time up is always a charm! Shot it out to 300 even at 2400 still acceptable drop. That’s about it though. Didn’t save much weight chopping 4” off but pretty handy rifle. May flute it and lighten the stock as 375 is a light kicker to me compared to others. Anyhow did the job and feel adequately gunned in a hairy situation. I also brought 5 rounds of flat nose solids in case extra hairy situation. Alas that never materialized and it was down and out very quickly!

quote:

Originally posted by 4WD:
GS,
Thanks for your information on your results with the factory Remington/Swift A Frame loads.
Also congratulations on your Grizzly!

Blew the dust off the .375 H&H Oxford binder.
Chronographed factory ammo, 5-yard instrumental velocities:

250-grain Sierra SpBT GameKing Federal factory ammo (1993) 60*F: 2670 fps, 24" barrel (Douglas custom)

270-grain Winchester Power Point factory ammo (1991) 90*F: 2750 fps, 24" barrel (Whitworth Mk X)

300-grain Winchester Silver Tip factory ammo (1991) 90*F: 2471 fps, 24" barrel (Whitworth Mk X)

300-grain Swift A-Frame Remington factory ammo (2000) 75*F: 2502 fps, 25" barrel (CZ550 Mag)

300-grain Swift A-Frame Remington factory ammo (2000) 75*F: 2473 fps, 24" barrel (WinM70 Cl.St.)
[An earlier lot of this ammo gave ~2535 fps instrumental and pierced primers, gave sticky bolt lift, in same rifle.
There may have been a recall on that lot of ammo, there should have been anyway, whatever.]

300-gr Trophy Bonded Federal Premium "Safari" factory ammo (2001) 96*F: 2430 fps, 24" barrel (Douglas)

300-grain Swift A-Frame Remington factory ammo (2001) 96*F: 2441 fps, 24" barrel (Douglas)
..................................................................................................

And then I settled on a handload of the old 300-grain Barnes X-Bullet in that same 24" Douglas barrel that started the above list and ended it,
a No. 3 sporter contour, 1:12" twist, stainless:
300-grain Oldest type Barnes XFB
COL about 3.55"
RL-15 72.0 grains
96*F July 16, 2001.
F215 primer
9-shot average = 2528 fps instrumental, with 9-fps St. Dev.
High of 2544 fps
Low of 2514 fps.
Accuracy (3-shot) was about 0.75-MOA at 115 yards, zeroed 2.5" high at 115 yards.
That was about half the size of groups with factory ammo.
That is the load that went to Botswana in August 2001.

Rip ...

Thanks!
Appreciate everyone’s information.
RIP, special thanks for the detailed info. Sounds like all three brands have loaded the .300grain Swift A Frame pretty close to advertised specifications, but still waiting for actual chronographed factory Swift and Federal Premium A Frame velocity.

I have laid in a small supply of each brand to try out. So far I have only shot the factory Remington load in two different .375H&H rifles. I have not had any pressure signs with the Remingtons. Just getting the rifles sighted in so I have nothing to report accuracy wise.

Anyone chronograph the Federal and Swift factory .375H&H A Frame .300GR loading?

About everything I chronographed was from 2400 to 2450 FPS as were all my handloads, although a good handload can top 2500 but not much, I built a long throated 375 at one time and got 2600 plus, but in my opine it isn't worth the effort..slowing down a 375 300 gr. bullet always seemed to improve penetration and killing effect with better bullet performance, just an observation, right or wrong Im good with it.

^

In Kevin Robertson’s Book “Africa’s Most Dangerous” he stated his belief that slowing a 300gr .375 down 150fps or so increased its effectiveness on buffalo.

BH63

quote:

Originally posted by BuffHunter63:
^

In Kevin Robertson’s Book “Africa’s Most Dangerous” he stated his belief that slowing a 300gr .375 down 150fps or so increased its effectiveness on buffalo.

BH63

So that would mean a 300 grain bullet at 2350 FPS - assuming original velocity as 2500 FPS - is better for buffalo??

Not in my experience.

2700-2800 FPS works best for us.

quote:

Originally posted by BuffHunter63:
^

In Kevin Robertson’s Book “Africa’s Most Dangerous” he stated his belief that slowing a 300gr .375 down 150fps or so increased its effectiveness on buffalo.

BH63

I can only imagine that being the case if one was using marginal bullets that were over expanding/shedding cores etc.

Only in the fact that both will kill a buffalo..again caliber comparisons are vague and usually without fact unless one uses a stop watch to see which one kills the fastest!

The slower bullet in a cup and core will penetrate best as a rule, the faster bulletin cup and core will expand more and do more internal damage in most cases, both work well enough IMO.

Monolithics seem to do their best work with high velocity, and they also penetrate better with high velocity and they to kill well.

Im not sure it makes a great deal of difference as long as the bullet is placed properly.

I know that Kevin Robertson aka Doctari, a large animal vet, has an extremely large number of Cape buffalo kills to base his opinion on, and I also know that Saeed has probably more buff to his credit than anyone I know of, probably approaching or passing 300 by now, so there ya go, opposing views from the most experienced in the game..

Alf, you’ve missed your calling. You should have been a defense lawyer. You could have gotten Lee Harvey Oswald and Jack Ruby off and saved the Agency a lot of work.
I knew that guns don’t kill, people kill but was surprised to learn that bullets don’t kill either.
So combining your logic and mine we can presume that hunting animals that result in death is caused by the hunter causing wounds that sometimes results in death but that without perfect correlation. So it is the person behind the trigger that is the only causation factor that is perfectly correlated.
That won’t sell many new Guns bullets or wonder thingies.

The longer we humans make our equations attempting to gain some claim on knowledge, the more obvious the supremacy of our Creator becomes. The Breath of life cessation is not calculated using bullet form or speed would be a fair summary. The causation of The Breath of Life is also a great mystery to man only solved by belief.
My best to you Alf.

Never heard from anyone who actually provided chronograph results for the factory Swift 375 H&H .300 GR A Frame loading . I did find the Swift loading to be 2” higher than the Federal Premium Cape Shok .300Gr Swift A Frame. From my experiences that tells me more velocity with the factory Swift load. Both are pretty accurate , but the Swift was extremely accurate.

quote:

Originally posted by 4WD:
Never heard from anyone who actually provided chronograph results for the factory Swift 375 H&H .300 GR A Frame loading . I did find the Swift loading to be 2” higher than the Federal Premium Cape Shok .300Gr Swift A Frame. From my experiences that tells me more velocity with the factory Swift load. Both are pretty accurate , but the Swift was extremely accurate.

A faster load in a big bore will often shoot to lower POI inside of 100 yards.
Less barrel time, the bullet exits before the muzzle has risen as much as with the slower load of similar recoil impulse.
You still need to chronograph your loads in your rifle if you want to compare their velocities.

Rip ...

quote:

Originally posted by RIP:

quote:

Originally posted by 4WD:
Never heard from anyone who actually provided chronograph results for the factory Swift 375 H&H .300 GR A Frame loading . I did find the Swift loading to be 2” higher than the Federal Premium Cape Shok .300Gr Swift A Frame. From my experiences that tells me more velocity with the factory Swift load. Both are pretty accurate , but the Swift was extremely accurate.

A faster load in a big bore will often shoot to lower POI inside of 100 yards.
Less barrel time, the bullet exits before the muzzle has risen as much as with the slower load of similar recoil impulse.
You still need to chronograph your loads in your rifle if you want to compare their velocities.

Rip ...

+1

Learn something new on here almost daily .

Think of working up loads for a double rifle to duplicate the load it was regulated with, for that one specified bullet weight and velocity.
Low velocity loads shoot high and wide.
Loads of desired velocity will shoot to regulation, dead on.
Higher velocity loads will shoot low and crossed.

Big bore handguns and rifles with one barrel do not involve crossing and uncrossing of windage,
but they often do the same thing with elevation as a double rifle,
for work up of a load for a specified bullet.
As powder charge is increased, velocity is increased,
and point of impact is lower for same point of aim.
I have seen it many times, most of the time, in fact,
including my last outing at the local range.

Now I will leave it for ALF to discuss any confusing and confounding factors.

Rip ...

quote:

As powder charge is increased, velocity is increased,
and point of impact is lower for same point of aim.
I have seen it many times, including my last outing at the local range.

It's true. I learnt this recently when working up a couple of loads for a .300 Win Mag. At first I thought it was me and how I was holding the rifle when fired. But the pattern repeated so I guessed it was the load. Never had this happen with .243W, .270W or 30.06 It worked out well though with the .300 Win Mag as the most accurate load shoots very close to the same POI as my current load.

So Alf, if we know the barrel rise in inches per second and multiply it by the time in microseconds, we will then have the rise at the muzzle in fractions of an inch. We just need to calculate what that would be at 100 yards. Seems straight forward (at least for you But for me math makes my head hurt now.

Hi Alf, I have read many of your posts with great interest. My theoretical knowledge is very limited with respect to firearms. I have noticed the same behavior RIP has with chronographed loads in my 7 1/2 lb 375 Weatherby and my 500 Jeffery. I've settled on a load for the Jeffery so it's not a factor (it might just be the way I hold the forearm). I shoot factory Remington Premier 300g A-Frames through the 375 Weatherby (about 2500 fps) and 350g Woodleigh handloads at the same speed. So it's not a factor I need to worry about but I do find it very interesting. Thanks for the well thought out and informative replay as always

Alf,
You are dead wrong and hiding behind
your usual "scientific" superciliousness.
You have been caught baffled by your own bull,
so now you must dazzle with brilliance.
It won't work this time.
There are too many shooters here with practical experience
rather than theoretical for you to get away with your
nonsense.
Re-read my last reply.
Note that it mentions single-barreled handguns and rifles also.
Not just double rifles.

An example of recorded effect of firing pin motion on the gun would be interesting. Have any “trace” pictures or graphs to share?

Pardon me Alf, but you can muddy the water on occasion! and sometimes you baffle the democrats with BS..