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> Oil in bore
Oil in bore
@ 02:51 pm (GMT) |
Peter BjerregaardHi all,Nathan mentions in his book (p 83) chrome moly barrels need a light coating of thin oil in the barrel as corrosion prevention on hunts in the hills. Where I come from conventional wisdom dictates that oil in the bore is an inherently bad thing when not in storage. Firstly it might damage the bore and secondly it will result in what is called an “oil shot” which might change point of impact of first shot as much as 2“ at 100 yards. Therefore everybody swabs their bores dry before a hunt (only day hunts in a small but wet country such as Denmark). Is this all wrong and does a thin coating of oil in the bore not matter at all? I could of course test this assumption but range time is a bit hard to come by where I live so instead I ask this great forum. //Peter |
Replies
@ 04:39 pm (GMT) |
Nathan FosterRe: Oil in boreHi Peter, a heavy coating of oil in the bore can be quite dangerous. What I am talking about is a very light coating of a light, fine grade lubricant. CRC Long life if is a good example, lightly sprayed onto a rag. Some companies go to great lengths to produce shoot-over-lubes, Militech 1 is an example.If the bore has no copper fouling, the shot may well be off by 1" at 100 yards to begin with. A light coat of lube does not alter this, the POI is still off the mark and 1" is about the norm unless the rifle produces wide fliers with fouling shots. If the lube is applied over a fouled bore, the successive shot is much closer. Recently, I fired my first shot of the day at 800 yards, bore was copper fouled the week before, then light lubed. Point of impact was dead on at 800 yards. It is important to test these things, find out how lube effects the POI. You could of course not lube at all, if hunting for just one day. My preference is to lube regardless, I have seen too many ruined bores, not from single day hunts, but from continued single day hunts. That said, a single day hunt followed by dumping the rifle in the lock up after being too weary to clean the rifle can have negative results. The overnight hunts are the 24 hour killers. Moly coatings (hygroscopic) add further problems. I will make up a small book in a while, going into minute detail on maintenance procedures and monitoring the bore. There is such a great deal of misunderstanding in this area and it is easy for things to go wrong. For example, polishing and cleaning procedures need to be matched to the individual bore. Each bore is different, bores change with age so we have to use individual cleaning techniques. |
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@ 05:54 pm (GMT) |
Peter BjerregaardRe: Oil in boreHi NathanThat is a book well worth looking forward to. A whole system by one individual is much better than short opinions on different details by different people. It is then up to oneself to decide if it is the Truth. I will certainly test this on the range with my 1900 sporterized Swede. It is actually funny that none of the parts match up except bolt and cocking piece, and it still shoots 1 MOA of a bipod with factory ammunition. Receiver is from 1900 though. //Peter |
@ 09:49 pm (GMT) |
Jim MoseleyRe: Oil in boreThe old timer that built my 7 mag told me to use Kroil oil during the break in period and shoot one shot and clean, then run a wet patch of Kroil and shoot the barrel wet. This is a stainless steel barrel so I don't know if it makes a difference. I've shot over 400 rds thru the barrel and it only takes 4 patches to clean the barrel and I store the rifle with a wet bore using the Kroil. |
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