TackDriver284
Handloader
- Feb 13, 2016
- 2,685
- 2,556
Took the 6 Dasher out for the first time, and let me tell the history of this barrel. The new 30 inch Bartlein barrel was on the existing 6 BR / Rem 700, the old 26 inch barrel was used in 600 yard matches and did very well until it was toasted. A gunsmith chambered a new barrel for the BR on the same Rem 700 action, and I got it back. It had very hard bolt lift after firing for some reason, even from mild to max loads that I usually use, so the rifle was returned back to the gunsmith and he tested it, and he did mention it has a hard bolt lift but no reason was given. He talked me into a Dasher, and he would chamber, rebed the new action, and all work at no charge, and I was OK with it, so I bought an Impact Precision custom action, and he rechambered the same barrel to a 6 Dasher, and barrel was not cut, he used the same BR chamber and reamed it out. He did test fire it, about 30 rounds and sent it back to me. He mentioned that it shoots fine. About 50 rounds was fired down that tube previously. Last night I prepped the cases and I had to deburr the case neck mouths on the outside, it had a little lip on the edges and did not want to scratch my new Short Action Custom dies, its a full size with a .265 bushing and a carbide mandrel in .2425", and yes, that is .0005" neck tension. It's my first time I used half a thousand neck tension. Alpha emailed me last week that the case neck thickness are .0125" for my lot which was in transit to my house and a loaded round will be a .269" for my info to get the bushing size. Upon getting the brass, I made measurements and its .012" thick and concentric all around the necks, good stuff, and a loaded round is a .2675"- .268" When I charged the cases with powder, there was a little mess, i think some Hornady One Shot lube was on the bottom of the funnel and some powder kernels was stuck to the funnel and when i transferred the funnel to another case, some kernels fell inside the tray without me knowing until I seated the bullets. Darn it, so powder charges are not exact. I did not bother to redo, was not worth my time, just wanted to test the rifle. Now let me go to the range results.
Winds was terrible at 5 pm, 20-25 mph headwind and full sun, mirage was beating me down. I had to sight in the rifle, it has the new ATACR 7-35 x 56mm, two shots later it was on paper @ 100, I only had three different charges 31.6, 31.9 and 32.2 grains Varget / CCI 450 SRP, new virgin Alpha brass. I see a little ejector mark with 31.9 and 32.2 grains. with 32.2 grains speed was at 2950 with 4 fps ES. The 31.9 grain charge was at 5 fps ES, the 31.6 was at 7 ES. I will back down to 31.2, 31.4 and 31.6 grains on the next trip out. I like to get a good tune to fireform all remaining 200 pieces of brass at the 600 yard match next month and the month after. The POI seems consistent on all 3 charges. I'll run some data in QuickLoad.
Winds was terrible at 5 pm, 20-25 mph headwind and full sun, mirage was beating me down. I had to sight in the rifle, it has the new ATACR 7-35 x 56mm, two shots later it was on paper @ 100, I only had three different charges 31.6, 31.9 and 32.2 grains Varget / CCI 450 SRP, new virgin Alpha brass. I see a little ejector mark with 31.9 and 32.2 grains. with 32.2 grains speed was at 2950 with 4 fps ES. The 31.9 grain charge was at 5 fps ES, the 31.6 was at 7 ES. I will back down to 31.2, 31.4 and 31.6 grains on the next trip out. I like to get a good tune to fireform all remaining 200 pieces of brass at the 600 yard match next month and the month after. The POI seems consistent on all 3 charges. I'll run some data in QuickLoad.
