|
|
Post by elkman1310 on Jun 16, 2020 6:31:21 GMT -5
Well I had planned on testing the 7/300 at 1K put have ben to busy . I had loaded up a some new cases with 63grs of H1000 and the 190 Hybrid so I tested them at 365yrds last evening conditions were really good. This gun will shoot tiny bugholes at 100 yards which is unusual for a big long heavy bullet like the 190gr. At 100 yards a 1/2 inch is pretty normal but then as it goes out from there the group stays together. This barrel will shoot in the .100 bracket but at 365yrds its a 1.5 inch gun already not good for benchrest at 1K.
Second problem is this case is not big enough to push a 190gr bullet up to 2850fps with out a lot of expansion even on a new case which is kind of surprising because a 300WSM pushes a 215gr 2850fps with no problem. So I guess I am parking the 7mm for now. It just maybe the 190gr bullet will not shoot all that good no matter what you try but the 190gr Hybrid is the reason I built the gun oh well. |
|
|
|
Post by gd357 on Jun 16, 2020 14:49:53 GMT -5
Thats a bummer. Sounds like maybe the velocity is restricted more by caliber than case capacity with the 190s. At least it should be acceptable for hunting out to 700 or so, depending on how groups hold up at that range.
|
|
|
|
Post by elkman1310 on Jun 17, 2020 7:44:34 GMT -5
Yes I had hi hopes for the 190gr bullet. The 180gr vld shot better out to 1k. I didn't build this for hunting only target competition there are still a few other bullet choices to try but it gets old real fast trying to make a gun shoot competitively. With the 6mm Dasher and the 300wsm its fairly easy with the know proven powders and loads if the gun doesn't shoot good with on of those loads its not a good enough barrel to win anything.
|
|
|
|
Post by elkman1310 on Jun 20, 2020 17:33:32 GMT -5
Well I loaded up some 175gr SMK bullets with 66.0 grs of H1000and a 215 primer and shot that load this morning at 1000 yards.I shot a 10 shot group (7) shots went into 3.5 inches but I had two low shots and one high shot out of the group the high shot really hurt causing the 10 shot group to measure 8.6 inches. That's the best this gun has shot.
I have been annealing this brass using my AMP induction annealing machine.Since I turn the necks to 13.5 the chart they provide really didn't have a good setting for the Winchester brass. I had been working off a lower setting which I found out is to low and really was not annealing the neck and shoulder of the case enough because all the brass I fired today had a heavy shoot ring on the neck and around the shoulder not a good thing. So I pumped up the heat on this brass to see how its going to seal up that cause really cause fliers at 1k with neck tension.
I looks like this barrel just doesn't like a Berger bullet.
|
|
|
|
Post by gd357 on Jun 20, 2020 22:02:50 GMT -5
Well, at least the SMKs are showing some possibilities at 1000. Hopefully the change in the annealing process will help the consistency.
Really funny how different barrels have decidedly different preferences. Thats part of the fun, although finding a solution quickly would be good too...
|
|
|
|
Post by elkman1310 on Jun 23, 2020 8:18:42 GMT -5
I loaded up the same cases I tested at 1000 yards to check the velocity on each one to see if there were some that gave low and high numbers. I loaded 66.0grs of H1000 a 175gr SMK and used 215 primers.
The powder was weighed out to the nearest one thousands of a grain 66.000 one kernel will put you over or under especially with bulky powders like H1000. The primers all weighed the same the bullet ogive was the same and the weights of the bullets was within a hundredth of a grain.
for 15 shots the low was 2955 and the high was 2960 (5 feet STD). That is really good for a big case and it will shoot. My biggest problem was annealing the brass to the correct setting on my AMP annealer I had it to low and the brass really wasn't been annealed enough. So if your neck tension isn't correct or exactly the same you will get some odd balls at 1,000 yards.
All the brass I tested last evening was annealed to a new setting I think that it helped with the STD. Weighing primers is a vey important step in long range accuracy but you need a scale that will measure out to at least .00gr. My scale goes out to .000grs and .0000 grams
|
|
|
|
Post by jims on Jun 23, 2020 12:17:38 GMT -5
That long range stuff really takes fine tuned components it seems.
|
|
