243 90gr Etip

[baltz526]

velocity strings: 2.660=2771-2757-2718-2714-nr. 2.680=2796-2756-2744-2715-2738. 2.700=2773-2698-2702-2708-2693. 2.720=2831-2767-2734-2734-2739. load is RP brass, cci250, 44gr imr7828ssc. with the 2.700" oal load it was the most consistant and most accurate. It was interesting to see the velocitys jumping around with oal. then when you look at the groups and see the load that was most accurate also the most consistant. All these loads where as close to exactly the same as possible with the only change oal.

 

[FOTIS]

3 Shot groups fellas..... Let it cool! :wink:

 

[baltz526]

5 shot groups for load development give a lot more information. Once the load is fixed and rifle is sighted for the range it will be used for, then i might use a three shot group. Or i might shoot 5 shot groups. Or i might shoot multiple 2 shot groups.

 

[FOTIS]

I agree, but for accuracy testing sloooooooooow 3 shot groups. If you do not feel good about that then 2 or 3 slooooooooooooooow 3 shot groups. :grin:

 

[baltz526]

also when crongraphing i shoot 5 shot groups, to get a better shot string. I shoot out in the forest so light changes over time effect the cronograph. These groups where shot at 110yds on the range finder.

 

[CAhunter]

Baltz Not a bad start with the etips. Ive been having good results with IMR4831 and Fed 210M. Well under 1" groups.

 

[baltz526]

This 18" barrel gun has shown best velocity with H414 and 85gr sierra hpbt game kings. 44gr has given 3093fps average. If the 90gr Etip likes H414 i hope to get a couple hundred fps improvement. This barrel is unusual in that the first shot out of a cool barrel is almost always 60fps or more faster than the second shot. and 100gr bullets run 2660fps using h4350 and h414. factory remington 100gr run 2627fps average.

 

[Guy Miner]

"I agree, but for accuracy testing sloooooooooow 3 shot groups. If you do not feel good about that then 2 or 3 slooooooooooooooow 3 shot groups."

It's interesting, I've seen top-notch benchrest competitors shoot their groups FAST before conditions change. Not necessarily when dealing with much wind either. They don't dink around. When the conditions are right, they hustle and send those bullets downrange. Literally in seconds.

Most "high master" NRA prone shooters strive for the same thing - putting their rounds downrange as quickly as possible, before the prevailing conditions change. They've got 20 minutes for the slow fire prone stage at 600 yards, and some riflemen struggle to get all twenty rounds downrange in that time limit. Most of the High Masters get those rounds downrange in eight minutes or even less. The target has to be pulled, scored and marked between each shot, so it's not just the shooter who is in control of the pace in the NRA prone matches.

The barrel heating up from rapid firing is in distant second place compared to changing environmental conditions when accuracy is the goal.

Guy

 

[Guy Miner]

"Curious, why would you do a lands test prior to a powder ladder test?? Seems to me that you would set the round .10-.15 off the lands to start and work on powder loads. Then once you figure your zone, work on distance off the lands to bring your groups even tighter."

Some rather well respected riflemen maintain that seating the bullet straight, and at the correct distance from the lands (which varies) is more important than the actual charge weight for accuracy.

Worth considering...

 

[SJB358]

"I agree, but for accuracy testing sloooooooooow 3 shot groups. If you do not feel good about that then 2 or 3 slooooooooooooooow 3 shot groups."

It's interesting, I've seen top-notch benchrest competitors shoot their groups FAST before conditions change. Not necessarily when dealing with much wind either. They don't dink around. When the conditions are right, they hustle and send those bullets downrange. Literally in seconds.

Most "high master" NRA prone shooters strive for the same thing - putting their rounds downrange as quickly as possible, before the prevailing conditions change. They've got 20 minutes for the slow fire prone stage at 600 yards, and some riflemen struggle to get all twenty rounds downrange in that time limit. Most of the High Masters get those rounds downrange in eight minutes or even less. The target has to be pulled, scored and marked between each shot, so it's not just the shooter who is in control of the pace in the NRA prone matches.

The barrel heating up from rapid firing is in distant second place compared to changing environmental conditions when accuracy is the goal.

Guy

I have always shot groups like this as well. I shoot 3 rounds as fast as I can cycle the bolt, aim in and get it out of the tube. The 264WM is changing that a little, as I think it needs to be bedded cause just about everything loaded thus far throws the third round out. I think with some proper bedding, I will be able to maintain a good slow fire in order to shoot for groups. I slowed down to about 1min-30sec last time and that seemed to help, but my idea is to see where the first three shots will land in a hunting situation. Scotty

 

[baltz526]

First powder test is 2.700" oal, RP brass, Rem 9 1/2 primers, W760. 40gr-41gr-42gr. 5 each

 

[baltz526]

Got out today for some load evaluation. With the w760 and the 90gr etip. I did get the velocity i was hoping for. 40gr 2871fps- 41gr 2972fps- 42gr 2960fps out of the mod 7 18" barrel. But accuracy was not where i was hoping. I'll retest at 40.5gr and try 2.705" and 2.695" to start. If i see no improvement I'll settle for the 2700fps 44gr imr7828ssc 2.700" load.