Call Tom, I know the phone works.

Rich
DRSS
Knowledge not shared is knowledge lost...

Jedi Boomie is coming to the rescue soon. I sent him a picture to put post and set things in context. L2R: 600gr JSP, 715gr NEI, 881gr NEI my modified version at 735gr, and that ubiquitous 480 Ruger loaded round.
The 600gr JSP is 1.075", the 715gr NEI is 1.227", the 881gr NEI is 1.480", my modified 735gr is 1.228", and the 480 round is 1.615" long.

KDM, you out there? Make the NEI RFN bullet in a 1.300" or so, and get it to 760-775gr weight. Or the NEI 881 cut down to that length. If you want to play with some on your lathe I will send you a few. A maximum effect .550" bullet needs to weigh in about the same as the .577NE 750gr bullet, just a little faster.

Rich
DRSS
Knowledge not shared is knowledge lost...

Veterans Day Range Report: went to the VFW chili feed in Wilder, Idaho after church. Then, accompanied by my lovely wife out to the range to see what 135 grains of WW748 or H335 would do with the 600gr JSP's. I would suggest that we are getting into serious recoil levels here.

135gr WW748 and 600gr JSP.............2225, 2231, and 2219fps
TKO Value:105, Recoil Energy 104ft/lbs@25fps, 6,579ft/lbs ME

135grH335 and 600gr JSP...............2478, 2482, and 2490fps
TKO Value: 117, Recoil Energy 130ft/lbs @ 28fps

With a ten and a half pound rifle I am not sure I want any more speed. "Barked" the knuckle on my shooting hand index finger a pretty good lick with the H335 loads.

Mu initial impression is that these JSP loads with a lighter bullet have a faster, more whip-like recoil sensation.
I am getting ready to test the modified 881gr/735gr NEI bullets next week.

What a fun day.

Rich
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glad you had fun...time to get that lead sled

10.5 lbs is obviously too light.
It should be increased in weight to 10.75 pounds by hiding 4 ounces of lead in the stock.
That should do it.
If not, a muzzle brake will add even more weight.
Please don't break that pretty stock with a PbSled. Use no more than a 25# bag of shot between the rifle and shoulder when you are having a bad day. Just 2 cents worth for free.

Rich
You are now at the top end of the "legal' 550 magnum loads.. but in a 10.5, whew, too light...

get the lead sled, and put ONE 25# sack in it. you are trying to slow down the recoil the most, DO NOT try to stop the rifle.

Ron, I respect you, but I bet I've sent more rounds down range on a leadsled than most ...

don't use alot of weight

jeffe

My wife has put up with this brand of lunacy for nearly twenty years, and is the venerable "think outside the box" partner. She had noted that there was some significant muzzle rise over the 715gr 2100fps "warm up" first two shots. We are back here, and she says "...that thing KICKS!, isn't there anyway to tone that down...?". Not thinking technically (the Lead Sled) I say "...yeah, add some weight to the rifle...but that makes it hard to hold up, or carry around...". I am reading her RIP and Jeffeosso's posts, and she says "...wrap a flour sack around a bag of that shot stacked against the wall, and duct tape it to the forend...". Gosh, I love that woman...and smart....? Oh, yeah.

Since my gunsmith is off slaying Bambi this week, and Brownell's has not delivered the NECG Express rear sight, I been shooting this thing like a shotgun, just seeing velocities and comparing recoil sensations. A bag of shot taped to the front end will not affect anything but recoil and muzzle rise. Wait 'til tomorrow...
140 grains of H335 and WW748 here we come!

Rich
DRSS
Knowledge not shared is knowledge lost...
& out of the mouth of THE BABE!...a solution

That's why I have my 550 to 15 lbs and long
barrel.Soon to be a 28GA FH with rechamber.
You could take off pad, hollow out butt and
add 3 lbs lead shot and epoxy. It'll act
like a different gun and better than
a brake.I sure the 335 loads extract easy,
you got to go to 140-145 gr.And with 748
you can fill it up.Ed

Recoil, muzzle rise, AND torque control.
Three birds of a feather with one stone.
Should be easy on the stock too.
No stress on the wood. Stress is on the tape.
It will pad and protect the gun as long as you can get the adhesive off the wood without marring or staining it. Tape it tight.
Your wife is a genius.

Drill three 3/4 inch holesin the stock and recess the forearm. Add 4 dead mule mercury recoilreducers and epoxy themin place.Alternatively just add a crap load of #9 shot and epoxy into the 3/4 inch holes. Add a F990 recoil pad while your at it. This will help considerably. Personally a integrally machined muzzel brake with 1/8 holes will make a much bigger difference but to each his own. Jeffe has seen my 585 Nyati set upjust like this. A 10.5 lb rifle at these levels is a handfull without the mods I've described. I personally also don't use a led sled, shoot off hand at 35 yrds, roll with the recoil,but fight the torque with your arm.-Rob

LOL,
Seen it.. shoot it, busted rocks and OTHER STUFF with it.. and Rob "Wingshot" a feral hog, BANG@@@@@

awesome nyati..!!

RGB,

I researched your 600 OK posts, man what a cannon. I appreciate your advice, and RIP and Jeffe's. If I wrap the flour sack all the way around the forend/barrel it will not be marred. I would be concerned about shooting it with duct tape directly on the barrel. Ever smell melted duct tape?

Thanks Ed, I am going to push the 748 alongside the 335 and see what I get...besides hammered.

Rich
DRSS
Knowledge not shared is knowledge lost...

Geez! This is just for load development! Do not overheat the barrel!

Then strip it back down to 10.5 pounds naked (the rifle, not you) and go hunting like a man!

That rifle will be slipping and spinning inside the flour sack. Forget the flour sack.
Wrap the gun with duct tape to protect it. Then tape the shot bag directly to that and wrap it tight.

Or use velcro.

Glue some Velcro to the bottom of the forearm and then sew the other half of the Velcro to the shot bag. Add velcro straps around the bag and forearm to strap it tightly together.

Shot bag is then quick detachable for field use of rifle when the load development is done. Make sure the soft and fuzzy part of the Velcro is on the forearm.

Some take a 25 lb bag of shot and set it on something on bench to get it shoulder
height, then hold gun against it and shoulder..
Get it high enough so you set up straight,
so you and bag move. Ed