Sorry, charlie boy, same rifle could not possibly have fired all 25 rounds used in the killing of three generations of the same family...
Based on what evidence?
All analysis to date by Jeremy supporters has been pure BS.
I have seen a variety of claims that non-Eley ammunition was used in 5 rounds, another supporter claims 7 rounds, some call them lighter others heavy. The only thing consistent in these claims is no evidentiary support is presented for the claims to estbalish there was any non-Eley ammunition used. There are 2 ways to establish such:
1) testing the chmical composition and finding it totally different from Eley's formula
2) from the shell casings
The latter is the most obvious and easiest manner.
The misrepresentations about the bullet characteristics that match the Anschutz are legion.
Fletcher observed 3 main features that tied the bullets to the murder weapon:
1) 8 L&G
2) narrow lands meaning the grooves are wider than the lands
3) rifling marks that are made by imperfections unique to the barrel of the Anschutz and no other weapon- these are called individual or accidental characteristics while the first 2 are class characteristics
Which bullets suffered the least damage and were most intact? The 3 bullets that exited June and bullet that exited Daniel. These bullets had all 3 of the characteristics above present. PV/29 in Daniel also had all 3 of these present according to Jeremy supprters.
A bullet is round and you can roughly look at 120-150 degrees at any given time. Looking at 120 degrees at a time you can get 3 views that cover everything.
Many bullets fragmented and expanded and the outside parts that broke off were the parts that had the impressions from the lands and grooves. When that happens you might only have a small section that still has any impression remaining from the lands and grooves and/or the unique rifling marks.
Even if there are not 8 lands and grooves you still could be able to potentially match the lands and grooves remaining and the accidental marks to a particular cross section of a test bullet and this match enables you to say it was fired by the same weapon even though you don't have an entire bullet.
A bullet that is damaged too much and can't definitely be tied to the gun coudl still potentially have been fired by it. The only way to rule it out as having been fired is if it has characteristics that demonstrate it was defintiely fired by a different gun.
I have yet to see reliable documents that for sure came from Fletcher that account for all the claims made by Jeremy supporters about what exactly what was observed on each and every bullet.
For instance, the Holab form for PV/2 indicates "general and small amount of detail" match from the Anschutz. General means class characteristics and the detail part refers to the accidental characteristics. The accidental characteristics is what RM refers to. Yet numerous charts and posts say no RM for PV/2.
The claim that Fletcher noted some bullets had wide lands has not been demonstrated at all. Rather where narrow lands were not found because insufficent detail was on the bullet has been misrepresented by Jeremy supporters as Fletcher finding wide lands, though the reality is not being able to make an effective measurement so unable to determine the measurement of the lands.
The first Holab form I looked at is PV/8 which is hard to read but looks like it says same L&G width as the Anschutz but too damaged and small to match.
This is what I have pieced together from the claims of Jeremy supporters without correcting anything so there may be more errors thant the 2 I mentioned above, indeed it is impossible to detect 0 lands and yet claim narrow lands were detected so there was a typo somewhere or someone a mistake in reading something:
Master Bedroom
Nevill
PV/2 (Shoulder) (5L) (NL) (no RM)
PV/5 (jaw) fragment broken from either PV10 or PV11
PV/10 (lip) (WL) (no RM)
PV/11 (neck) (4L) (WL) (no RM)Arm/chest Graze wound-1 of the following: DRH/5, 9, 15, or 35 (all 8 L&G) (NL) (RM)
June
PV/23 ( 0 )(NL) (no RM)
PV/24 (4L) (NL) (has RM)
PV/25 (5L) (NL) (has RM)
PV/26 (5L) (NL) (no RM)
3 of the following DRH/5, 9, 15, or 35 (all 8 L&G) (NL) (RM)
Sheila
PV/19 (WL) (no RM) PV/20 (NL) (RM)
Kitchen
Nevill
PV/3 (skull) (NL)
PV/4 (skull) (NL) (RM)
PV/8 (skull) (WL)PV/9 (skull) (?)
Twins
Daniel
PV/29 (8 L&G) (NL) (RM)
PV/34 (WL)
PV/35 (WL)
PV/36 (WL) DRH/36 (8 L&G) (NL) (RM)
Nicholas
PV/30 (3L) (NL)
PV/31 (NL) (RM) [bullet 3 fragmented into small parts in the head and was not recovered]
The wide/narrow lands claims are fiction but at any rate if one wants to claim that the bullets that failed to register narrow lands were fired from a different gun that means Nevill was shot with 2 guns in both rooms he was shot in,that both boys were shot with 2 guns and Sheila was shot with 2 guns. The yellow represents the shots claimed to be from other guns.
In the meantime the shots in both boys and 4 in Nevill's head were tightly grouped and assessed to have been fired in rapid succession from the same gun. 2 people firing together are unlikely to get a nice tight grouping.
I wonder how many other errors I will find in the above claims anyway with respect to number of lands and grooves found, whether the land width matched the Anschutz and whether the individual barrel characteristics were found.
Again though the fact a bullet lacks enough detail doesn't prove it wasn't fired from the Anschutz it merely means there is insufficient detail to say it was eefinitely fired from the Anschutz and other evidence like the spent casings will have to carry the day.