- Location
- Southern Vancouver Island
Dang straight and well put fer sure.
Short barreled 30-06
- Thread starter tommy88
- Start date
I still have my Powley Computer. Used to get one when you bought the Ackley book set. Very useful device for calculating loads etc. It's basically a multi adjustable set of slide rules. - dan
I still have mine as well, but it was only meant to be used with IMR type powders, or so the rumor goes.
I use it to calculate percentage loads for other manufacturers offerings at the same burn rate and bulk. Works quite well.
I use it to calculate percentage loads for other manufacturers offerings at the same burn rate and bulk. Works quite well.
Today I was at the range with the 20” 1640 30-06 165gn TTSX going over 2900fps no stiff/heavy bolt lift, easy extraction, cases are in good shape, but primers are flat ish, not totally filling in the primer pocket(still a midge of radius on the primers) but they are flat!! I will back up the powder charge, first because I need to sit the bullet a little deeper and see what happens!
Sorry, (maybe your joking) but the mythical numbers of 25 to 30fps has been disproven a 1000+ times I'm sure. Caliber, powder, bullet and what length is the barrel to start with makes the difference. As above post of a 45-70 only loosing 100fps with a 13" shorter barrel. I've cut 3" off my 300wsm , 6 different loads averaged a loss of 14.5fps per inch. 760 Winchester only lost 3fps per inch and H3450 lost 18fps per inch. The only way to really know is to do it.
My 30 fps/inch referred to the 30-06. This was based on my experience when I cut down a 32" used target barrel to a 22" hunting barrel, 1 inch at a time and then chroned ammo at each length. It was about 30 fps per inch.
The only problem I have had with short barrels is the bark, but I found that some powders are better/worse than others, so I load accordingly.
The only problem I have had with short barrels is the bark, but I found that some powders are better/worse than others, so I load accordingly.
Are you're talking about two different guns, or at least different barrels when you mention a 15" and 26" barrel in 45-70?
So he didn't get 100fps difference by chopping the barrel, it is two different guns with two different barrels. Even identical guns coming off the assembly line can show significant differences in velocity, so you can't really draw any meaningful conclusions about how much velocity you'll lose per inch based on this data.
Each rifle is different. I used to build rifles 3 at a time (Me. wife and son) Barrels were McLennan barrels, made at the same time and then chambered with me own reamer. ach rifle had its own favourite load, sometimes needing 3 different powders. The worst example was a set where with the same ammo, one was 150fps faster than the slowest.
This is why I took the opportunity to cut one down and measure the changes.
This is why I took the opportunity to cut one down and measure the changes.
I cut a model 70 30-06 sporter 24” tube down to 20.5 this summer.
I hunted that rifle in factory configuration for 15 years, cut it last summer and hunted it this fall with the short barrel, haven’t once thought about how to get my long barrel back.
Same load shot just as well before as after, might of lost some velocity but I’ll never see or notice the difference.
I hunted that rifle in factory configuration for 15 years, cut it last summer and hunted it this fall with the short barrel, haven’t once thought about how to get my long barrel back.
Same load shot just as well before as after, might of lost some velocity but I’ll never see or notice the difference.
