Being new to re-loading...I lack any logic in the grand scheme of things...Please bear with me...

OKAY, now I know I don't have access to what powder Winchester uses in their 270Win. 130gr Power-Point Ammo....

This factory ammo however is shooting .5 or less 3-shot groups consistently out of my son's rifle.

If, I was to chronograph this load and determine its avg. MV and say its 3015fps.

If I worked up a load using IMR4350 or any other common powders for the 270 cartridge, would I be safe or correct to assume...that if I used the same bullet at or near 3015fps MV...that I could possibly find that same SWEET SPOT on this rifle...

Just a thought on MV and Accuracy for using the same bullet/same rifle....

Thank you for take on this...

in theory it would get you ?something?,
but with a diffrent powder you will have a diffrent pressure curve than say winchester factory ammo. my guess would be that you will have to tweek the load up or down and probably will find a better load than the factory fodder.
also:
Just read your other post.
There are several powders that will over lap and give you roughly the same velocity.
best to pick a powder bullet combo and work up a load.
The experimenting is what reloading is about.
within bounds of course.

quote:

f I worked up a load using IMR4350 or any other common powders for the 270 cartridge, would I be safe or correct to assume...that if I used the same bullet at or near 3015fps MV...that I could possibly find that same SWEET SPOT on this rifle...

It's not a safe assumption....nor is a bad one either...it's a start.

You're best off to pick a powder that your loading manual shows is capable of that velocity in their loads. Then simply work up!

If it don't cut it for you pick another powder....I'll bet there's five or more powders that can make the .270 duplicate that velocity.

curiosity got the best of me.
I just tore down a factory load 130gr and it had extruded powder 55.1grs. could be imr 4350 H4831 or something winchester dreamed up.

You really can't reverse engineer factory ammo. Most factory ammo is loaded w/ powder not readily available to the handloader. You can make a load that performs the same, but you'll have to build it from scratch using a handloaders manual or other info. & work up. Ever rifle is different. What works in yours may shoot like crap in mine & vis versa.

Mass produced Factory ammo can vary from lot to lot as well, depending on what mix they use.
When buying box ammo, it was always suggested to me to buy them from the same lot number printed on the boxes to cut down on variations in performance as you use them.

True, next year if you buy the same ammo, it could shoot 3" groups. Every time the factory gets powder and measures the burn rate, they need a different amount. Nothing says they will use the same powder each time either. The bullets can change also.
My friend always bought Federal premium loads every year even though he only shot a few shots each year. He had several hundred stored up. One day his niece dumped them all on the floor for fun. He put them in an MTM box but he could not hit a thing anymore. I had to pull them all apart and found 6 different powders just by appearance and 5 different bullets. Each lot would need a different sight setting.
Nothing says the velocity being the same will shoot the same. Pick a powder, bullet and work loads until you equal it and stay with it. The small differences in canister powder lots will not effect you as much as lot changes in factory ammo.
That is the reason we handload!

If he doesn't shoot very much, just go buy several boxes of that ammo. (As others pointed out, there can be lot to lot variations with factory ammo that is substantial.) That's a pretty good result for what I presume is a sporter weight hunting rifle. On the other hand, if you are like many of us handloaders, you can't resist tinkering.....

Then go for it. But I would recommend a better bullet. I have not used Power Points, but a little stouter bullet than the Power Point would give him a more versatile rifle. I.e. using a partition, accubond, TSX, A-Frame, Northfork, et cet. would give him a weapon more useable on game larger than deer and with less than ideal shots.

Pick the bullet he wants to use and then try different powders.

LWD

Thank you for all you replies...

I'm beginning to understand it all much more clearly thanks to all of you...

I will choose a couple of powders and work-up this same bullet...

I really like the terminal performance and accuracy from this conventional plain Jane ammo on the deer-sized game we've been hunting.

Again, thanks to everyone for your input...

Roland

LB,

Measure cartridge overall length using ogive and keep them the same. This is the sweet-spot.