Re: Gradous Rifle Thread
I have my load figured out for a new 308 Gradous rifle. I was experimenting with which primers gave better groups, CCI Benchrest, 210 Federal or CCI small rifle 450 magnum (using Lapua Palma brass) all at 200 yards.
At 200 yards the CCI small rifle 450 magnum primers produced best results @ .475” and Federal 210 second best @ .611” The CCI benchrest primers were worst with 1.257" group. They were only 3 shot groups. All shooting off a bipod and a rear squeeze bag.
I only had three rounds left and they were loaded using Federal primers. I figured I'd go ahead and shoot them at 600 yards. Result was .988” . Next I need to see how it shoots at 600 yards with CCI 450 magnum primers. I suspect better but you never know.
I need to shoot a 10 shot group when conditions are very good. I know it will not be a 1” group. I suspect it will be about 2” to 4” which is quite acceptable. Anything better than 2” and I will be amazed and be thinking Robert built me a benchrest rife in disguise. Load was same for all except primers and brass. Large rifle primer brass was Nosler and small rifle was Lapua Palma.
Load info.
44gr of varget, 175 Nosler custom competition bullet
3.157" base to ogive
distance of ogive to start of lands=.025"
Group of brass and bullets were not weighted
I have been shooting the Lapua Palma brass with 175 SMK's or Nosler Custom Competition bullets for over a year using a TRG-22 and they have proved to be the most accurate using 45gr. of varget and CCI 450 primers. The Gradous rifle is more accurate than the TRG-22.
I may also try some wolf sr primers, the copper colored ones. They were excellent with TRG. Same as the CCI 450 magnums. I believe the Palma team has used the Wolfs, copper colored ones. Wolf made or makes three sr primers. The copper colored ones, silver colored ones, only difference is cup is harder on silver colored one. Both have same amount of primer material. The other one is also silver colored but has more primer material in it. I think it's consider a magnum primer. It maybe to hot for my use.
<span style="font-weight: bold">Of course there are no uniform standards by which to judge primers </span>