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splatman · June 5, 2012, 08:43 PM

OK so I discovered that I could not load these bullets within 0.020" off the
lands because they would not fit in the magazine. I used the Dan Newberry load
development strategy see optimalchargeweight.embarqspace.com/. Using Retumbo with 300 grain berger hybrid OTM Tactical.

Powder charges tested (89 grs 2704 fps), (89.7 grs, 2737 fps), (90.4 grs 2783 fps), (91.1 grs, 2783 fps), (91.8 grs, 2754 fps), (92.5 grs, 2812 fps), (93.2 grs, 2836 fps), and (94 grs, 2873 fps). Listed here is the top velocity, 3 rounds per
tested charge. COAL was 3.735. Note that above data shows that no increase
in velocity was attained with increase in powder charge. This might be due to
errors in the chronograph (using the Prochronograph). Best group was 1 inch
at 100 yards with 91.8 grains. Still not acceptable since I am capable of shooting 0.5 inch MOA. I have been experimenting with Retumbo for quite
awhile. Should I switch to another powder? Did notice that the barrel was
quite warm, how much will this affect accuracy? Cannot figure this gun out,
my Savage 308 is a Tack driver. Don't know where to go from here. I think
I should be able to get better accuracy out of this gun but not sure now.
Any suggestions?

June 5, 2012, 08:43 PM	#35
splatman Member Join Date: April 12, 2012 Posts: 94	OK so I discovered that I could not load these bullets within 0.020" off the lands because they would not fit in the magazine. I used the Dan Newberry load development strategy see optimalchargeweight.embarqspace.com/. Using Retumbo with 300 grain berger hybrid OTM Tactical. Powder charges tested (89 grs 2704 fps), (89.7 grs, 2737 fps), (90.4 grs 2783 fps), (91.1 grs, 2783 fps), (91.8 grs, 2754 fps), (92.5 grs, 2812 fps), (93.2 grs, 2836 fps), and (94 grs, 2873 fps). Listed here is the top velocity, 3 rounds per tested charge. COAL was 3.735. Note that above data shows that no increase in velocity was attained with increase in powder charge. This might be due to errors in the chronograph (using the Prochronograph). Best group was 1 inch at 100 yards with 91.8 grains. Still not acceptable since I am capable of shooting 0.5 inch MOA. I have been experimenting with Retumbo for quite awhile. Should I switch to another powder? Did notice that the barrel was quite warm, how much will this affect accuracy? Cannot figure this gun out, my Savage 308 is a Tack driver. Don't know where to go from here. I think I should be able to get better accuracy out of this gun but not sure now. Any suggestions?