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The main reason for my question is because of something I read in the directions that came with my RCBS Precision Mic. There was a section of the directions in bold that read "Bullets should be seated in the case neck to a depth at least equal to the bullet diameter to provide correct allignment with the bore.". The two rounds I'm reloading are: 1. Hornady 168gr A-max boat tail. Hornady's book shows a C.O.L. of 2.800 2. Sierra 168gr HPBT Match. Sierra's book shows a C.O.L. of 2.800 When I use the RCBS Precision Mic along with the method with a case & bullet colored with a marks-a-lot, I show the C.O.L. specific for each bullet for my rifle to be as follows: 1. Hornady 168gr: 2.982 2. Sierra 168gr: 2.954 Considering the above statement by RCBS, what do they mean, should I even be concerned with it? If so, both bullets are boat tails and I'm wondering if they are talking about the seating depth being from the case mouth to the absolute base of the bullet or the boat tail shoulder? I would assume they are talking about the amount of the bullet body contacting the inside of the case mouth which would mean they are talking about the boat tail shoulder. According to the statement by RCBS, I am not allowed to seat the bullet custom to my rifle because it exceeds thier recommendations. Any info on this will be greatly appreciated. Thanks! | ||
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One of Us |
The directions with the Mic is the minimum amount of of bullet to be seated in the case seating more is acceptable so you can easily seat the bullets to the C.O.L. of 2.800 and I would use that as seating to the 2.982 or 2.954 is likely to cause 2 problems A) Reduced pressure due to increased volume and B) That large of an increase in length may not even fit in the magazine or may put the bullets into the lands. Even my spell checker wants to replace Obama, it just doesn't have any suggestions. jerry.baldwin06@comcast.net | |||
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One of Us |
Am I correct in assuming you are coloring the bullet with Marksalot, inserting the bullet into the case, then cambering the round to determine C.O.L with bullet just touching the lands? **************************The two enemies of the people are criminals and government, so let us tie the second down with the chains of the Constitution so the second will not become the legalized version of the first. | |||
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One of Us |
Published C.O.Ls are nothing more than a rough guide. When looking at C.O.Ls for a particular gun and cartridge, you need to take the lesser C.O.L of: 1. that a minimum of one bullet diameter be in the case neck (some folks use 90%). 2. The cartridge must fit and feed from the magazine. 3. The round must chamber less any desired distance from the lands. Mike Legistine actu quod scripsi? Never under estimate the internet community's ability to reply to your post with their personal rant about their tangentially related, single occurrence issue. What I have learned on AR, since 2001: 1. The proper answer to: Where is the best place in town to get a steak dinner? is…You should go to Mel's Diner and get the fried chicken. 2. Big game animals can tell the difference between .015 of an inch in diameter, 15 grains of bullet weight, and 150 fps. 3. There is a difference in the performance of two identical projectiles launched at the same velocity if they came from different cartridges. 4. While a double rifle is the perfect DGR, every 375HH bolt gun needs to be modified to carry at least 5 down. 5. While a floor plate and detachable box magazine both use a mechanical latch, only the floor plate latch is reliable. Disregard the fact that every modern military rifle uses a detachable box magazine. 6. The Remington 700 is unreliable regardless of the fact it is the basis of the USMC M40 sniper rifle for 40+ years with no changes to the receiver or extractor and is the choice of more military and law enforcement sniper units than any other rifle. 7. PF actions are not suitable for a DGR and it is irrelevant that the M1, M14, M16, & AK47 which were designed for hunting men that can shoot back are all PF actions. 8. 95 deg F in Africa is different than 95 deg F in TX or CA and that is why you must worry about ammunition temperature in Africa (even though most safaris take place in winter) but not in TX or in CA. 9. The size of a ding in a gun's finish doesn't matter, what matters is whether it’s a safe ding or not. 10. 1 in a row is a trend, 2 in a row is statistically significant, and 3 in a row is an irrefutable fact. 11. Never buy a WSM or RCM cartridge for a safari rifle or your go to rifle in the USA because if they lose your ammo you can't find replacement ammo but don't worry 280 Rem, 338-06, 35 Whelen, and all Weatherby cartridges abound in Africa and back country stores. 12. A well hit animal can run 75 yds. in the open and suddenly drop with no initial blood trail, but the one I shot from 200 yds. away that ran 10 yds. and disappeared into a thicket and was not found was lost because the bullet penciled thru. I am 100% certain of this even though I have no physical evidence. 13. A 300 Win Mag is a 500 yard elk cartridge but a 308 Win is not a 300 yard elk cartridge even though the same bullet is travelling at the same velocity at those respective distances. | |||
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One of Us |
str8razor; How are you shooing the ammo-single shot or through the magazine? If through the magazine then the magazine lenght is the max. If single shot then you should have about a min. of 0.20" of bullet sidewall inside neck for a 0.308" bullet (I think thats what you are useing)down to about 0.10" for a 0.224" bullet. Just remember that if you develope a hot load with bullet set way out and and then go to magazin lenght that you can get into trouble as this will raise the pressure. The pressuare change could be up to 4/5000psi in some cartridges. If you go to a shorter OAL you would need to start with a smaller charge of powder and work back up. If I was in your situation I would get a good,and safe, load with the bullet 0.050" off rifleing and then work down to 0.020" in 0.010" steps. The speed with each step out will go down as you are lowerering the pressure of the cartridge. In reloading the thing that will cover your butt 99% of the time is "start low and work up". | |||
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