Laelkhunter
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He said the cartridge was a 300 Wby, but did not say it was a Weatherby rifle. Knowing the brand might help us with offering more suggestions.
WWYD - 300 WBY
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perma
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Yes, Mark V 26” barrel. No mods done to it, all factory.
Wind Gypsy
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to elaborate a little more - I would not expect a 1% change in powder charge to make a notable difference in POI @ 100 yards. You have shots from the other group that hit just as low of POI as the bottom one in group #2. Based on those 2 groups, if you shot a bunch more shots, i'd expect the various distribution to fill in around the areas of the 2 groups you shot. When precision is at that level, its hard to extract much conclusively from those type of sample sizes.
Basically, if that bottom one is indeed a flier and you didn't adjust scope between groups - the takeaway would be that a slighly more than 1% change in powder charge moved the POI by about 1.25 MOA @ 100 yards and I think that would be very unlikely. If you adjusted the scope between groups, well then please disregard
perma
Well-known member
Maybe I’m confused by what you’re referring to as POI. Are you thinking I was always aiming at the center target on those two groups?to elaborate a little more - I would not expect a 1% change in powder charge to make a notable difference in POI @ 100 yards. You have shots from the other group that hit just as low of POI as the bottom one in group #2. Based on those 2 groups, if you shot a bunch more shots, i'd expect the various distribution to fill in around the areas of the 2 groups you shot. When precision is at that level, its hard to extract much conclusively from those type of sample sizes.
Basically, if that bottom one is indeed a flier and you didn't adjust scope between groups - the takeaway would be that a slighly more than 1% change in powder charge moved the POI by about 1.25 MOA @ 100 yards and I think that would be very unlikely. If you adjusted the scope between groups, well then please disregard
To be fair, I did make some scope adjustments after the first group in the center, then shot at the upper left.
Wind Gypsy
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I assumed that you were aiming at the bullseye closest to each respective group. Since you adjusted your scope, my comment is not applicable in some regards.
Laelkhunter
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Since you are shooting a Mk V, which has the famous Weatherby freebore, suggesting loading the bullets to get closer to the lands won't work.
belshawelk
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? huh? My magnum shoots .28". Two more shoot under an inch. It can do better
10 shot groups?
perma
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I tried that a long time ago too, actually made it worse.
noharleyyet
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I owned .300wby and .257wby Mk V's...both shot lights out at the range with factory when the barrel was clean and cool, otherwise they were accuracy finicky...both dead flop'd critters.
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Laelkhunter
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Agree. Most have the thin barrels that heat up quickly, so you have to wait between shots for it to cool a little. I wait 1 minute between shots and 5 minutes between groups (or longer). Of course when hunting, you can't wait if a follow up shot is needed, but when trying to do a load workup and you are looking for the best groups, patience (and waiting for the barrel to cool) yields better results.
belshawelk
Well-known member
Sure if i let the barrel cool after 3 or 4. Those are 4 shot shot groups on this post.
maybe this gun cant but i am just saying just because its a magnum doesn't mean it cant shoot better. Some people cant shoot magnums better but that may not be the guns fault.
Wind Gypsy
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Tagging in for pics of the magnum hunting rifle 0.28" 10 shot groups.
Addicting
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You just need to start at the beginning and do a work up at .5 grains find the best then adjust seating depth. Your wasting time using any of your old info.
perma
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Before I get more confused with this thread I created, just wanted to thank you all for your advice. @Addicting suggested what I am doing now except I'm just starting a little hotter. I'm close to a good load, just need to fine tune some of my own processes to make this work out. More ladder tests to come in a few weeks after I finish up my salmon fishing trip, and we'll close this one up after I get a satisfactory load and a lot made.
Yeah, that's pretty impressive. I have some targets I saved year to year when checking zero before hunting season. All around .5 MOA. But only 5 shots as an unbraked RUM is kinda spicy. With a brake I bet the rifle would do a 10 shot group at the same accuracy. mtmuley
Wind Gypsy
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I used to do this and wasted lots of components chasing unicorns.
For the most part if a powder and bullet dont shoot decent at most any jump and charge weight I change powder or bullet.
noharleyyet
Well-known member
The difference between 3 impacts at sub inch plus 1 flyer is usually at least 3 more rounds...flyers are expensive
Addicting
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Currently he has found more of a rhino than a unicorn. He needs to go back to basics.
To be honest, that looks like a 4ish MOA system to me (defining accuracy as what size target can be hit on command at least 95% of the time).
I'd be changing the bullet at a minimum, if not the barrel or entire rifle.
Maybe you can get lucky and find out that something is loose or the scope is broken.
I'd be changing the bullet at a minimum, if not the barrel or entire rifle.
Maybe you can get lucky and find out that something is loose or the scope is broken.
