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7mm mag
lightingbolt
Member Posts: 37 ✭✭
I've read articles and looked at charts and stuff, but have never actually shot the 7mm mag before. My questions are: 1) When compared to the .270 is the increase in performace worth the additional recoil and ammo cost (considering Eastern US hunting -- mostly whitetails)? 2) Is the 7mm mag as versatile as the .270 in regards to loads, bullet weights available, and hunting opportunities? Thanks.
Comments
If the rifle repeatedly shoots the way you describe then you have a bedding problem as the POI shifts with the barrel warming.
Remove the barrel/action from the stock and look over the stock. In the process of breaking the rifle down you will note if any of the hardware is loose. If you find that problem, retighten and try shooting again to see if things have changed. If all is tight, examine the internals of the stock. Has it been bedded? And if it has how does the bedding look, any sign of damage?
If you don't find anything with the stock visual exam reassemble and check to see if the barrel is free floating. Use a piece of paper slipped between barrel and stock at the beginning of the forearm. If the paper passes all the way back to the action/stock bolt the barrel is fully floated, if the paper stops before then you have a partially floated barrel and that is typically not conducive to accuracy.
If you find that the barrel is fully free floated use some heavy stock paper, business cards work well. Use 3-4 thicknesses under the barrel, an inch or so back from the tip of the forearm. Then fire the rifle to see what the change is.
If you find that the barrel is partially floated use an appropriately sized dowl and starting w/ some medium grit sand paper smooth out the barrel channel from where the barrel ceases to be floating. Go slowly and finish off with some fine grit sand paper. Then reassemble and shoot to see what the change is. And if POI is still starting low and comming up as the barrel warms use the business card step outlined above.
Many barrels like 6-8 pounds of upward pressure at near the end of the forearm.
If you find no bedding in the stock at all and the barrel free floating then you may want to start by bedding the action, testing the rifle and then making a decision on bedding the barrel. and if you've never done any bedding work, you may want to look into having a gunsmith do the work for you. Regardless of bedding the carding to put upward pressure on the barrel should show improvements from cold POI to warm POI and if it don't then your back to the gunsmith option.
If you only have time to do two things so-so, or one thing well ... do the one thing!
good luck [;)]
it would be easier to help with more info
7mm mag is a good cartridge what do you plan to hunt with it ?
how long of a barrel ?
A lot of rifles like to be lightly fouled before they start shooting right. (Yes Virginia you can have a barrel "to" clean).
The other posters have given you some other things to try, but the best approach is to only try ONE thing at a time, starting with the simple ones.
Some guys like a mag full of lead, I still prefer one round to the head.
If the crack is very minimal,..then that may not be it at all. Try looking at the action screws where they thread into the bottom of the action,..be sure there is no oblong look to those holes. Then,...try waiting 5 minutes between shots,..snd see if it does the same thing. Also,..an answer to tailgunners question would be a big help. I have a match barrel that needs 5-6rnds to settle down after cleaning,..then it shoots great. As well,...conduct the barrel float test as suggested by contender man,...if you wrap a dollar bill under the barrel,..and hold it on either side of the barrel,..then slide it up toward the action,..and it drags or binds before it reaches the action,..that could very well be it also. That would point to your barrel warping under the heat of being fired,..and the point at which it makes a firmer contact with the stock,..changes the harmonics of the barrel resulting in the second point of impact,..which remains until it cools again. many possibilities here,...try to gather an answer for all the questions asked by everyone,..and get back to us.
why chase the game when the bullet can get em from here?....
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