Sierra 155 gr.HPBT bullets

Jimro, M118 match ammo specs are mean radius averaging 3.5 inches at 600 yards. Extreme spreads of that will be in the 11 inch range. None of the ball powder charged M118 ammo shot in the 7 inch extreme spread range like the better lots of extruded powder lots. And the National Match lots in the 1960's shot extremes in the 6 inch range; mean radiuses of 1.7X inches. I've broken down several lots of M118 to check the powder used and all the not-too-good lots all had ball powder.

One doesn't have to be a crack shot to tell the difference between 1.8 MOA ammo and 1.2 MOA ammo. That's the typical difference in M118 ammo with the ball and extruded powders.
 
HiBC, when one makes comparisons between ported and nonported barrels' muzzle velocity, they better both have the same bore and groove diameters. Same firing pin impact force on the primers, too. And the same lot of ammo's got to be used. There's easily a 50 fps spread in muzzle velocity with the same load across several rifles of the same make, model, caliber and barrel due to tolerances in their bore and groove diameters.
 
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Bart B.

I'm not saying that ball powder with the #43 primer was as good as IMR 4895, what I'm saying is that there is a known delay in ignition issues with WC846 with military primers. http://www.dtic.mil/cgi-bin/GetTRDoc?AD=ADA341390 The recommendation was to standardize to WC846FS (Flash Suppressed) as it showed more consistent ignition with either the #43 or #34 primers. The report states that case fill was critical in getting proper ignition with WC846.

Jimro
 
Sorry I didn't get back sooner

Thank you for all your info. Had to put my Dog down yesterday, my best friend for 14 years & I'm heart broken. It's a tuff thing to do. I didn't think I was such a softy, I will miss her.
 
Sorry to hear that.
Been through that several times, as I'm sure many here have as well; doesn't make it any easier :(

Quickest way out of the grief process for me, has always been another puppy- and quick ;)
 
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