Quote:
Originally Posted by Dean2
Just out of curiosity, what did Barnes have to say?
|
I never heard back. I did use comparable data from multiple sources and cross referenced charge weights and bullet types with weights from 200 to 225g. From that I was able to make an educated guess of a safe start point for Varget and the 200g TTSX bt.
I set my COAL to 3.325 as the recommended length of 3.330 for the Barnes bullet was just about too long for the magazine.
I loaded from 54.5 to 57.3 grains in increments of .5 then .3. No pressure signs and every load extracted well. I could go heavier but at 57.3g of Varget I'm nearing compression.
Both 54.5 and 57.0 shot extremely well. The limiting factor for this rifle (rem 7600 carbine) is the trigger. But I have a Timney sear and spring kit that should solve that.
Next batch will be 57.0 and I'll back them out to 3.300 and move them in by 10 thou at a time and see what works best. And I'll run them over the chrony to see if I'm in the ball park for velocity. I'm hoping for at least 2600 fps. If not, I'll play with BL-C(2) next.
I like Varget because it seems to reach compression before max pressure. Not always great, but for this action that is desirable. I'm using Fed 210m primers. I might try again with 215m if the velocity is still lagging.
Colin