Extreme velocity spread

If we only had a way to tell before we shot them which bullets out of a box will shoot in a spread of say 6 feet per second it would surely help quite a bit.

Until then, we well just have to settle for a few flyers.

Concho Bill
 
Bill

Bill Wynne said:
If we only had a way to tell before we shot them which bullets out of a box will shoot in a spread of say 6 feet per second it would surely help quite a bit.

Until then, we well just have to settle for a few flyers.

Concho Bill
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How do you know you did not miss a condition? Your flags only cover 5 yards out of 50 yards.
 
Bill I agree. I suppose we could test every round but then we wouldn't have anything to shoot on match day.

And I disagree as stated on another thread by someone else that tuning will minimize a dropped shot. Don't believe me, try shooting those low velocity rounds at 200 meters and they hit 8 inches below the target. I'd like to see anybody tune that out.
 
chronographs

It would be interesting to fire a string , say 5 shots across three
chronographs at the same time, to see if the ES and SD all agree.
Got to wonder ?
 
RF vs BB's

Landy
Waiting for your 22RF test over this setup. I know testing over a single setup using different rifles or barrels, will give conflicting results.
 
MKnarr said:
I modified the data in my above post to include the average of 6 groups in each lot and no they did not track exactly. Note the second lot actually had the second smallest group avg. but with the Extreme spread of 55 FPS, I'm sure that lot would come back to bite me in the butt sometime. Having chronographed a lot of ammo, I know for certain that a lot of match ammo, Eley Match included, will have rounds that are low velocity compared to the remainder of the lot. If I ignored one round in that lot that was at 1005 fps, the sigma drops to 9.6 and the ES drops to 34 FPS. I also know for certain that that one round will very likely be low on the target. And in fact, that one round was low and opened the group up from about .25 to .387.

My point is, without the chronograph results, I may have chalked that one round up to me and might have purchased that lot. Besides 50 yard benchrest for score, I also shoot 100 yard group matches and Benchrest Silhouette matches at 65, 75, 100, 150 and 200 meters. That one round could cost me a match in either discipline if used at 100 yards and beyond.
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Reading this and all the other usefull stuff in this thread might give me some sleep tonight.:) I have spent the last two days in two different tunnels testing rimfire from different manufacturers using two different guns. In one tunnel we had the gun "bolted" to a big ironconstruction and in the second tunnel we were shooting from high quality BR front and rear rests.
We did not use any chronos this time but previous tests has given similar results as You other shoved in this discussion.
What did I learn:confused: Well obviously I´m not such a bad shooters as I first thought. Like MKnarr has stated, there are rounds that could cost You a match, especially when shooting 100 yards and above. In the second tunnel, due to a very special echo one could hear when a single shot clearly sounded different from the others. This strange sounds did hit high or low.
So my total conclusion is that You either live with it, or guit competing. My thoughts right now is to guit 100+ yardages and stick to the 50 yard scoreshooting. It would be a too big punishment not to meet all the nice guys at the range and cry on the bad ammo the´r selling us.:rolleyes:
 
OK, if we accept that 30/35fps is about the norm and we are occasionally going to have flyers. What’s the thinking on fps compared to wind speed?

I ask this question because I am on the understanding you guy’s in the US prefer slower stuff (high 1040’s to high 1050’s) for windy conditions.

I was at a match in Germany recently and the shooters that were doing well were mostly using R50 (1084fps) and the Italian guy who was the overall winner was using Lapua Polar Biathlon (1106fps).

The conditions ranged from 4mph to +30mph (flags getting blown over) and from every angle of the compass. It was difficult to get more than two shots off before the conditions changed again, but the guys using the R50 and Biathlon just seemed to be shooting through it. (no doubt they were reading the wind better than me, but that doesn’t explain it all)
 
Brian,

Depends what you are trying to do. If the wind is going every which way and you’re trying to pick a condition where you hold the 10 ring and drive it down the middle, faster is better. If it’s blowing from one direction and you are holding off a bit and just sliding it on the wind the slower speed seems to have less drift.

If the question is which gives less drift in the wind, the answer is slower. But if you asked which gives better scores in the wind? I think you saw first hand on your recent trip in Germany what works, I’ve always used faster ammo.

Peter
 
Brian k, the results you posted from the tenex although not a significant amount would suggest staying away from #4 machine, that machines spread is 125%+ of the others.
 
Peter Armstrong said:
Brian,

Depends what you are trying to do. If the wind is going every which way and you’re trying to pick a condition where you hold the 10 ring and drive it down the middle, faster is better. If it’s blowing from one direction and you are holding off a bit and just sliding it on the wind the slower speed seems to have less drift.

If the question is which gives less drift in the wind, the answer is slower. But if you asked which gives better scores in the wind? I think you saw first hand on your recent trip in Germany what works, I’ve always used faster ammo.

Peter
Click to expand...

I think you are 100% correct Peter. The Tenex I have shoots great in a calm/constant wind. I’m going to stock up on some R50 (no chance of getting the Biathlon) and try it on the next “switchy” day.

Congratulation, by the way on your great scoring at the Aussie Nats. You certainly seem to have the hang of shooting in difficult conditions.

Brian
 
Brian,
You’ll find the R50 not as lot sensitive as Eley and I’ve said to you before I’ve had lots the will give an extreme spread of 9fps for 10 shot groups and most of it will average around 15fps. I’d leave the Biathlon alone, that’s about the same speed as R100 and I’ve won a few matches shooting R100 but you can get into some trouble with ammo that fast too. These days I just make do with my supply of X-Act, it seems to work for me in the wind.

Peter
 
Bob, it's the second series of numbers, 1009- 05071 indicates that machine #5 produced that lot. to say you cannot go what's on the box has to be put in perspective, test one lot today you will have one range. test the next brick another. because someone here or elsewhere tests and the numbers vary are just a snapshot at that time of testing, nothing more and nothing less. I wish I had the coins from all the ammo setting in basements and garages from ammo that didn't pan out from 1 box testing.
 
Ammo testing

Martin you said a mouthful on your post #34 been there done that
 
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