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> Precision long range hunting and shooting
> Confirming my arithmetic....
Confirming my arithmetic....
@ 04:33 am (GMT) |
Paul LevermanI have a hard time grasping the concept of MOA vs. inches. To me, it is a totally foreign concept, much like our neighbours to the south trying to figure out metric (no slight intended, just an analogy).My situation now is that I cannot find a suitable 20MOA rail that fits my P-14 action. The easiest solution for me is to machine the rear of the action down to a point where the ring bases will be at their correct heights. The following is the method I used to determine the difference in height of the bases, but to me, it doesn't sound or look right. If any of you can help to confirm my answer, or correct it (which is probably the case), I would greatly appreciate your help. 1 MOA = 1.047" @ 100 yards 1 MOA = 1.047" @ 3600" Spacing for the cross-bolts on the bases = 5" 1 MOA = 0.00145" @ 5" 20 MOA = 0.029" @ 5" If these calculations are wrong, and I mill my action to this result, there's no turning back. |
Replies
@ 08:08 am (GMT) |
Nathan FosterRe: Confirming my arithmetic....Hi paul, if you need more elevation, the rear will have to go up (cannot machine the front to go down as it goes through the case hardening layer if any is present.The best way is to shim your rear base and laminate each shims (see your copies of the books - Accurizing). Shim up, then use Burris rings with inserts to prevent any scope body distortion. The good thing about shimming is that you can very easily start over if you get it wrong. Once in place and properly laminated with epoxy, the mount system will be very strong. This is a very common way to deal with the older rifles. |
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@ 08:25 am (GMT) |
Paul LevermanRe: Confirming my arithmetic....Sorry, Nathan. I forgot some important info in the first post. The rear is already way too high (by about .180"). So to my thinking I have to reduce the height until the rear base sits approximately .029" above the front. Again, it's hard for me to grasp this, so I hope I am going the right direction. |
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@ 09:06 am (GMT) |
Nathan FosterRe: Confirming my arithmetic....Its tricky business for sure and I have gotten the math wrong myself in the past.If the rear is high, the rifle must therefore be shooting below the bull and you have no more down clicks. In this case, I would still shim the front but with no epoxy. Just shim with cut up coke cans, assemble, bore sight and fire a couple of shots. If your shim is the right height, you can then measure its thickness, then mill this thickness off the rear. How does that sound? |
@ 10:00 am (GMT) |
Bryan WebsterRe: Confirming my arithmetic....Quote: Its tricky business for sure and I have gotten the math wrong myself in the past.
If the rear is high, the rifle must therefore be shooting below the bull and you have no more down clicks. In this case, I would still shim the front but with no epoxy. Just shim with cut up coke cans, assemble, bore sight and fire a couple of shots. If your shim is the right height, you can then measure its thickness, then mill this thickness off the rear. How does that sound? Years ago I had the same issue and resolved it the same way Nathan. (with the recommendation of a local gunsmith, as I would not have figured it out on my own back then.[b] |
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@ 10:51 am (GMT) |
Nathan FosterRe: Confirming my arithmetic....Actually if you are .180 high, it might be hard to form up shims, even for basic bore sighting. Hope I am not leading you the garden path. |
@ 11:11 am (GMT) |
Thomas KitchenRe: Confirming my arithmetic....HI Paul can you confirm if your action is square at the rear or round?I have one of each, the square one from memory has Mauser weaver base on the front, forget what weaver number is on the rear and I use burris rings with moa offsets. The round receiver actually uses Remington two piece bases and will be fitted with Burris rings again. |
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@ 01:18 pm (GMT) |
Paul LevermanRe: Confirming my arithmetic....Yes, it was quite the feat trying to get a shim pack to stay in place while installing the base. I think I'll find it next spring in the weeds on the east side of the house.The action is flat/square on the rear, and yes I can get to where I want to be if I offset +20/-20, but then the scope has only .004" clearance on the objective lens. It's probably enough, but I was hoping for a little more. It looks like it's going to be done by the famous gunsmith company of Cutt, Fytt and Trye. |
@ 05:53 pm (GMT) |
Warwick MarflittRe: Confirming my arithmetic....Paul..........Are they the Parent Company of Curse Bang & Hurl or Hit Thumb & Howl. ...... I can't remember which one formed first and if they've been amalgamated yet...... Some one may have brought the copyright for these rights.......😲 |
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@ 12:02 am (GMT) |
Paul LevermanRe: Confirming my arithmetic....I'm pretty sure they were bought out last century. You are correct, they have amalgamated and a new international conglomeration has been formed. They went public last year and stocks have gone through the roof. They've actually split three times in the last two months. Google them to find their site and get in on amazing stock options now! But wait! If you act in the next 30 seconds, we'll double your price at no extra charge. (All you pay is forever!) Check out the write up in the Weasel Piss Creek Financial Review. Search for : Maydit, Wurs, and Brokit. |
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@ 07:41 pm (GMT) |
Warwick MarflittRe: Confirming my arithmetic....The price of anything. Is the amount of life you exchange for it........... |
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@ 02:19 am (GMT) |
Paul LevermanRe: Confirming my arithmetic....Well, from arithmetic to mechanics to humour to philosophy. That's quite the progression. It's amazing how the mind wanders and finds the means to protect itself.OK, one more: People today know the price of everything and the value of nothing. |
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